Found the edges of the front subframe had some surface rust after a few winters. Visible from the front wheel well if you look closely.
Also near the top of the rear wheel well there are little gussets. One of mine wasn't covered with the factory undercoating well and began to rust where water can collect in it.
Subframe mounts and diff case get surface rust as well.
I didn't see any problems on the bottom of the unibody when I put the underpanels on 3 years ago, so that's probably fine, though you have a bit more winter than I.
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